Woodworking salad drilling countersink screw drill bit flat bottom countersunk hole high-speed steel drill core secondary step step sub-mother drill

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Color classification:: Drill core diameter * drill sleeve diameter * total length (novices recommend several more drill cores) non-calibration to do any diameter length, 7-10 days of delivery (after contact and then shoot) Another alloy type professional woodworking step drill can be customized φ3*6*100 φ3*8*100 φ3*100 φ4*8*100 φ4*9*100 φ4*100*100 Ф4*100 φ4*12*100 Ф5*8*100 φ5*100 φ5*100 φ5*100 φ5*100 φ5*12*100 φ6*10*100 φ6*12*100 Ф7*12*100 Ф7*13*100 Ф7*14*70 Ф8*12*100 Ф8*13*100 Ф8*14*100 Ф8*15*100 Ф8*15*12*100 Ф8*15*100 100 Ф8*20*100 Ф9*13*100 Ф9*18*100 Ф10*16*100 Ф12*32*120 (alloyed) φ6.5*9*55 (alloyed) φ7.5*11*55 (alloyed) 3mm core (5pcs) 4mm core (5pcs) 5mm core (5pcs) 6mm core (5pcs) 7mm core (5pcs) 8mm core (5pcs) 9mm core (5pcs) 10mm core (5pcs)